Differential Processing of Nuclear Pore Complex Proteins by Rhinovirus 2A Proteases from Different Species and Serotypes

Overview

Journal J Virol

Publisher American Society for Microbiology

Date 2011 Aug 13

PMID 21835805

Citations 52

Authors

Kelly Watters

Ann C Palmenberg

Affiliations

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Abstract

Human rhinoviruses (HRVs) from the HRV-A, HRV-B, and HRV-C species use encoded proteases, 2A(pro) and 3C(pro), to process their polyproteins and shut off host cell activities detrimental to virus replication. Reactions attributed to 2A(pro) include cleavage of eIF4G-I and -II to inhibit cellular mRNA translation and cleavage of select nucleoporin proteins (Nups) within nuclear pore complexes (NPCs) to disrupt karyopherin-dependent nuclear-cytoplasmic transport and signaling. Sequence diversity among 2A(pro) proteases from different HRV clades, even within species, suggested individual viruses might carry out these processes with unique mechanistic signatures. Six different recombinant 2A(pro) proteases (A16, A89, B04, B14, Cw12, and Cw24) were compared for their relative substrate preferences and cleavage kinetics using eIF4G from cellular extracts and Nups presented in native (NPC) or recombinant formats. The enzyme panel attacked these substrates with different rates or processing profiles, mimicking the preferences observed during natural infection (A16 and B14). For eIF4G, all 2A(pro) proteases cleaved at similar sites, but the comparative rates were species specific (HRV-A > HRV-C ≫ HRV-B). For Nup substrates, 5 of the 6 enzymes had unique product profiles (order of Nup selection) or reacted at different sites within Nup62, Nup98, and Nup153. Only A16 and A89 behaved similarly in most assays. Since each type of karyopherin receptor prefers particular Nups or uses a limited cohort of binding motifs within those Nups, the consequences of individual 2A(pro) avidities could profoundly affect relative viral replication levels, intracellular signaling, or extracellular signaling, all of which are underlying triggers for different host immune responses.

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